Well it finally happened. I bought something from Ebay that has a problem. When it's in passive mode it sounds OK But if you use only the humbucker it gets very noisey. It has that same sound like when your amp is plugged in to the same circuit as a neon bar sign. I'm hoping it's just a grounding problem. Everything looked OK when I cracked it open, But the push pull volume knob does seem loose. Not from the circuit board but the rotating part of the pot. This is a Carvin 5 string with a coil tap and humbucker. Any suggestions where to start? Or should I just bite the bullet and get new electronics for it. Thanks for all your help. I was hoping someone else had already been down this road.